You can't. You can only find a PP Up
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You must give to them pp up, carbos.iron and other things
You Can't
You cannot buy PP Ups or Elixirs/Ethers in Pokemon Platinum. You can find them around the map, however.
You cannot buy a PP up in Pokemon crystal! You need to search for it in caves and other areas you might think it's in! Buy the guide booklet to know where items, Pokemon, and get to know gym leaders or pokedex!
yes. you may find them at: Cerulean City Five Island Water Path Cerulean Cave